Arvid Lunnemark

He represented Sweden at the 2017 International Mathematical Olympiad, scoring 17 points, ranking 188th and winning a bronze medal.⁠[1]

In 2018 he again represented Sweden, scoring 32 points, ranking 27th and winning a gold medal, the best result on the Swedish team.⁠[2]

He grew up in Malmö and attended the natural science program at Malmö Borgarskola, graduating in 2018 with top grades in every subject, and then went to MIT to study mathematics and computer science.⁠[3]

He interned at the payments company Stripe and at the trading firm Jane Street.⁠[4]

In November 2021 he wrote that end-to-end encryption protects message content but leaks metadata, argued for complete privacy that also protects metadata, and said he was working on a completely private messaging platform.⁠[5]

In 2022 the Swede co-founded Anysphere, the company behind the AI coding tool Cursor.⁠[6]

In 2022 he, Shengtong Zhang and Sualeh AsifSualeh AsifSualeh Asif is one of the co-founders of Anysphere, the company that develops the AI code editor Cursor, and earlier represented Pakistan at the International Mathematical Olympiad.Open the full entry, all affiliated with Anysphere in New York, published a paper proposing a complete security definition for metadata-private messaging, describing a vulnerability in existing implementations and presenting a protocol based on the Anysphere system they had deployed.⁠[7]

In June 2023 he wrote that prompting should be called “prompt design” and likened it to web design, and released Priompt, a JSX-based prompt library used internally at Anysphere; Anysphere then had five people in San Francisco building Cursor.⁠[8]

In August 2024 Anysphere raised a $60 million Series A led by Andreessen HorowitzAndreessen HorowitzAndreessen Horowitz (a16z) is a venture capital firm founded in 2009 by Marc Andreessen and Ben Horowitz. It invests from the seed stage through the growth stage and provides operational support to its portfolio companies.Open the full entry, with GoogleGoogleGoogle is an American technology company founded by Larry Page and Sergey Brin and incorporated in 1998. It became an Alphabet subsidiary in 2015. Its businesses include internet search, advertising, software platforms, cloud computing, and artificial intelligence.Open the full entry’s Jeff Dean, OpenAIOpenAIOpenAI is an artificial intelligence research and product organization founded in 2015 that develops the GPT model series, ChatGPT, Codex and a developer API, and conducts research on image, speech, video and intelligent agents. After its 2025 restructuring, the nonprofit OpenAI Foundation continues to control the for-profit OpenAI Group PBC. Its growth has involved large-scale fundraising and compute partnerships, and has also been accompanied by controversies over governance, copyright, privacy and AI safety.Open the full entry’s John Schulman and Noam BrownNoam BrownNoam Brown is a research scientist at OpenAI who works on reasoning, reinforcement learning, self-play, and multi-agent AI. The poker programs Libratus and Pluribus, which he developed with his advisor Tuomas Sandholm, defeated top professional players; at Meta he helped develop CICERO, an AI for the game Diplomacy; and at OpenAI he was a foundational contributor to reasoning models such as o1.Open the full entry, and the founders of Stripe and GitHub participating, bringing its total funding to more than $71 million; the company claimed more than 30,000 customers.⁠[9]

In September 2024 he published a long post on Cursor’s blog about the shadow workspace, which lets AI iterate on code in the background: then implemented as a hidden Electron window so AI could see lints and go to definitions without disturbing the user, with a kernel-level folder proxy envisioned for the future.⁠[10]

He appeared with Michael TruellMichael TruellMichael Truell is an American entrepreneur and software engineer who in 2022 co-founded Anysphere, maker of the AI coding tool Cursor, with MIT classmates and became its CEO; in 2026 Cursor was acquired by SpaceX.Open the full entry, Sualeh Asif and Aman SangerAman SangerAman Sanger is a co-founder of Cursor, an AI coding tool.Open the full entry, as founding members of the Cursor team, on episode 447 of the Lex FridmanLex FridmanLex Fridman is a Soviet-born, US-raised computer scientist and podcast host who works as an MIT research scientist on human-AI interaction and autonomous driving. His Lex Fridman Podcast is known for hours-long conversations with guests including heads of state and technology leaders.Open the full entry Podcast about the future of programming.⁠[11]

In June 2025 Anysphere confirmed that it had raised a $900 million round at a $9.9 billion valuation, led by Thrive Capital with investment from Andreessen Horowitz, Accel and DST GlobalDST GlobalDST Global is a technology investment firm founded by Yuri Milner in 2009 that focuses on growth-stage investments in internet companies worldwide; it has invested in companies including Facebook, Twitter, Alibaba, JD.com, Airbnb and Spotify, and in 2026 led the US$400 million Series B round of the AI visual content company Higgsfield.Open the full entry.⁠[12]

On October 17, 2025, he wrote on his website that he had told the team he was leaving Cursor, known as Anysphere for most of his time there, saying he was sad to leave the team and excited for the ideas he would explore next.⁠[13]

After leaving he founded Integrous Research, focused on “safer AI.”⁠[14]

After leaving he focused on new research projects on AI, information security and human freedom.⁠[3]

In June 2026 SpaceXSpaceXSpaceX is a company founded by Elon Musk in 2002 whose businesses include space transportation, Starlink satellite communications and artificial intelligence. It went public in 2026 under the ticker SPCX.Open the full entry announced it would buy Anysphere, which he co-founded, for $60 billion, with the merger expected to complete in the third quarter of that year.⁠[15]

Personal website: Public link: https://arvid.xyz/ (opens in a new window)⁠[16]

X: Public account: https://x.com/ArVID220u (opens in a new window)⁠[17]

LinkedInLinkedInLinkedIn is a social networking platform for professionals. It was founded in 2002 by Reid Hoffman and others, launched in 2003, and listed on the New York Stock Exchange in 2011; after Microsoft acquired it for approximately $26.2 billion in 2016, it became a wholly owned Microsoft subsidiary. Its revenue comes from membership subscriptions, advertising, and recruitment solutions.Open the full entry: Public profile: https://www.linkedin.com/in/arvid-lunnemark (opens in a new window)⁠[16]

Cursor: Official website: https://cursor.com (opens in a new window)⁠[10]